Working principle of hydraulic buffer system of hydraulic driven hoist and its main influencing factors were analyzed. System simulation model was established based on AMEsim. and influence law of overload valve diameter. overload valve opening pressure. https://www.roneverhart.com/Toshiba-AL13SX-AL13SXB30EN-300GB-15K-RPM-SAS-12Gb-s-512n-128MB-2-5-Hard-Drive/